Demonstration of etched cladding fiber Bragg grating-based sensors with hydrogel coating

Liu, Xiaomei; Zhang, Xianmin; Cong, Jun; Xu, Jun; Chen, Kangsheng

doi:10.1016/s0925-4005(03)00605-1

Cited by 85 publications

(43 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, sensing of those mechanical parameters using FBG can be performed by monitoring the shift of the Bragg wavelength of the FBG. The shift in Bragg wavelength with strain and temperature can be expressed using [11], (3) To employ FBGs as transducer for chemical measurands, swelling sensing material is coated on the FBG to induce mechanical effect on optical fiber [12,13]. The swelling action of coated material stretches the optical fiber and induces strain.…”

Section: Fbg Ph Sensor Operating Principlesmentioning

confidence: 99%

“…The pH sensitive hydrogel consists of 2-hydroxyethyl methacrylate (HEMA) monomer and acrylic acid (AA) monomer in 1:4 molar ratio, ethyleneglycol-dimethacrylate (EGDMA) as crosslinker, and 2,2-dimethoxy-2-phenyl-acetophenone (DMPA) as photoinitiator [18]. The coating procedure was similar to that described in [12]. To protect the hydrogel coated FBG from breakage and to eliminate bending stress, the hydrogel coated FBG was packaged using aluminum tube.…”

Section: Characterisationsmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of fiber Bragg grating sensor for pH measurement

Yulianti

Supa’at

Idrus

2014

2014 IEEE/ASME International Conference on Advanced Intelligent Mechatronics

View full text Add to dashboard Cite

A wavelength modulated optical pH sensor is presented. The sensor comprises fiber Bragg grating (FBG) coated with pH sensitive hydrogel. The sensing principle relies on wavelength shifts resulted from the induced strain on the FBG due to mechanical expansion of the hydrogel. The pH response of the sensor was simulated using free energy function by employing finite element method. Experimental work was carried out to investigate the pH response, time response, and temperatures cross sensitivity of the sensor. The results show that the sensor has a good reversibility and provides linear response in pH range of 5 to 7 with sensitivity of 0.114nm/pH unit.

show abstract

Section: Fbg Ph Sensor Operating Principlesmentioning

confidence: 99%

Section: Characterisationsmentioning

confidence: 99%

Characterization of fiber Bragg grating sensor for pH measurement

Yulianti

Supa’at

Idrus

2014

2014 IEEE/ASME International Conference on Advanced Intelligent Mechatronics

View full text Add to dashboard Cite

show abstract

“…The other type of pH sensor is based on swelling of hydrogels which is transferred to deflection of a micro-mechanic structure and then the deflection is detected by other sensors. Such as, swelling of hydrogel caused shifts of the resonance frequency of a quartz crystal microbalance in micro-gravimetric sensors or bending of micromechanical bi-layer cantilevers, as well as deflections of silicon bending plates in piezo-resistive pressure sensors [7][8][9][10][11][12] . For this type of sensor, hydrogel and other sensors are not connected, so it is more sensitive and reliable, but hard to be fabricated for multi-points monitoring.…”

Section: Introductionmentioning

confidence: 99%

PH sensor using fiber Bragg grating based on swelling of hydrogel

Dong

Gong

et al. 2012

SPIE Proceedings

View full text Add to dashboard Cite

To achieve pH detection of multi-points, a new pH sensor based on pH sensitive hydrogel swelling detection by a fiberBragg grating is proposed. The deflection of a silica membrane due to pH value change induced hydrogel swelling is measured by the center wavelength shifts of a fiber Bragg grating epoxied on the membrane. The relation between center wavelength shifts of the fiber Bragg grating with the hydrogel swelling behavior was studied experimentally. Around 100pm shift of the fiber Bragg grating center wavelength was observed when the pH value was changed from 4 to 7 or from 7 to 10 by using pH standard solutions, which fundamentally proved the feasibility of this method for pH detection.

show abstract

“…Some methods have been proposed for measurement of refractive index using fiber sensors. Long period fiber gratings (LPGs) have being widely investigated for refractive index measurement, whose mechanism determine that it is a highly sensitive to the surround refractive index, but there is serious cross sensitive [4] ; an etched chirp FBG that is used for refractive index, even it reduces fiber mechanical strength greatly [5,6] ; Matching of long and short period fiber gratings which is restricted by its low multiplexing ability [7] .…”

Section: Introductionmentioning

confidence: 99%

Cladding-mode obtained by core-offset structure and applied in fiber Bragg grating sensor

et al. 2011

View full text Add to dashboard Cite

Comparing to core-modes of optical fibers, some cladding-modes are more sensitive to the surroundings which are very valuable to sensing application; recently, a novel type of FBG sensor with core-offset structure attracts more and more interests. Normally, the forward core-mode is not only reflected and coupled to the backward core mode by the Fiber Bragg Grating in the step-type photosensitive single mode fiber, but also coupled to the backward cladding-modes and the radiation modes, eventually they will leak or be absorbed by the high refraction index coating layer. These backward cladding-modes can also be used for sensing analysis. In this paper, we propose and develop a core-offset structure to obtain the backward core-mode and backward cladding-modes by using the wavelength shift of the backward core-mode and the power of the backward cladding-modes in Fiber Bragg Grating sensor, and the power of the backward cladding-modes are independent from temperature variation. We develop a mode coupling sensor model between the forward core-mode and the backward cladding-modes, and demonstrate two coupling methods in the core-offset structure experimentally. The sensor is fabricated and demonstrated for refractive index monitoring. Some specific works are under investigation now, more analysis and fabrication will be done to improve this cladding-mode based sensor design for applicable sensing technology.

show abstract

Demonstration of etched cladding fiber Bragg grating-based sensors with hydrogel coating

Cited by 85 publications

References 7 publications

Characterization of fiber Bragg grating sensor for pH measurement

Characterization of fiber Bragg grating sensor for pH measurement

PH sensor using fiber Bragg grating based on swelling of hydrogel

Cladding-mode obtained by core-offset structure and applied in fiber Bragg grating sensor

Contact Info

Product

Resources

About